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### 6.2 Step 1 - Creating the XML Database

To create the XML database from the raw database stored into the folder `data`, use the command `MetaDB` as follows:

         $java org.metaqtl.main.MetaDB -e data/experiments.csv -m data/genetic-map \
                                       -q data/qtl-map -t data/trait_ontology.csv \
         			      -d data/marker_dictionary.csv -o xml

Note that the command is run into the current directoy (not in the directoy `data`) and that the ouput XML database is created into the directoy `xml` (it will be created by the program). Now, if we have a look to `xml` we can see 19 xml files, 18 summarizing the information of the 18 input mapping experiments and one file `ontology.xml` which gives the XML representation of the input trait ontology. Then, we will no longer use the file in the folder `data`: only the XML files in `xml` must be used to carry out further studies with MetaQTL.